mechanical changes required due to proposed irms rx v2 r. weber september 27, 2011
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Mechanical Changes Required Due to Proposed IRMS Rx
V2
R. WeberSeptember 27, 2011
2
Windows & CSU• No changes required for
window mounts• Because of the flip in
curvature of the focal surface, the CSU supports will need to be shortened by ~4 mm so that the focus is at the incoming edge of the central masking bar, rather than the exiting edge. Or, the instrument could be positioned ~4 mm further from NFIRAOS. TMT focus
(blue arc)Keck focus(ends of ray pencils)
Masking bar thickness
9/8/2011
3
Field Lens
• Girdle thickness increased from 11.5 to 12.9 mm- better for bonding
• Center of girdle shifted 2.694 mm towards CSU- lens mount flexure pockets machined deeper in cell
9/8/2011
MOSFIRE (solid)IRMS (transparent)
4
Collimator Barrel• Girdle center shifts: Col
#2= -0.5 mm, Col #3= 2.7 mm, Col #4= 1.6 mm, Col #5= 0.03 mm, Col #6= -0.05 mm.
• These relatively small shifts in the lens girdle centers should be achievable through a combination of cell spacer shim alterations and/or altering mount flexure pocket depths.
• Girdle widths are all comparable or slightly larger than MOSFIRE design- no bonding issues.
9/8/2011
MOSFIRE lenses(solid)
IRMS lenses(transparent)
5
Camera Barrel: (Cells #1-#4)• Cell #1: girdle center shifts -
2.0 mm and girdle thickness increases by 0.8 mm to 12.0 mm; minor cell spacer shim modifications required.
• Cell #2: girdle center shifts -1.6 mm and girdle thickness remains the same; minor cell spacer shim modifications required.
• Cell #3: girdle center shifts -1.9 mm and girdle thickness decreases by 0.7 mm to 52.7 mm; minor cell spacer shim modifications required.
• Cell #4: girdle center shifts -1.9 mm and girdle thickness increases by 0.6 mm to 11.1 mm; minor cell spacer shim modifications required.
9/8/2011
MOSFIRE lenses(solid)
IRMS lenses(transparent)
6
Camera Barrel: (Cells #5, #6, & Field Flattener/Detector)
• Cell #5: girdle center shifts -0.8 mm and girdle thickness increases by 1.8 mm to 9.9 mm; minor cell spacer shim modifications required.
• Cell #6: girdle center shifts -1.4 mm and girdle thickness decreases by 2.2 mm to 26.3 mm; minor cell spacer shim modifications required.
• Field flattener/detector: girdle center shifts -1.2 mm and girdle thickness increases by 0.6 mm to 9.9 mm; minor cell spacer shim modifications required.
9/8/2011 IRMS focal surface
MOSFIRE lenses(solid)IRMS lenses
(transparent)